Revert "Add rake task to purge old builds."
Revert "Add rake task to purge old builds."

This reverts commit c55e3b955f10fabf84a8c7e92ebbbe998c29ab97.

forresty/integrity,erik-escobedo/integrity,forresty/integrity,factorylabs/integrity,p/integrity,integrity/integrity,factorylabs/integrity,integrity/integrity,p/integrity,faradayio/ci1,dkastner/prism_ci,erik-escobedo/integrity,integrity/integrity,faradayio/ci1